<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../../src/function/call.js"></script>
</head>
<body>
    <script>
        //声明一个函数
        function add(a,b){
            console.log(this);
            return a + b + this.c;
        }
        //声明一个对象
        let obj = {
            c: 521
        };
        //添加全局属性
        window.c = 1314;

        //执行 call 函数
        console.log(call(add, obj, 10, 20));
        console.log(call(add, null, 30, 40));
    </script>
</body>
</html>